网络编程的TCP和UDP实现(Python)

缓冲区英文Buffer，因此缓冲区大小定义为BUF_SIZE

TCP服务端:

import socket

ip_port = ('127.0.0.1', 9000)
BUF_SIZE = 1024
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(ip_port)
s.listen(5)
while True:
    conn, addr = s.accept()
    print('接收到来自%s的电话' % addr[0])
    while True:
        try:
            msg = conn.recv(BUF_SIZE)
            print(msg, type(msg))
            if len(msg) == 0:
                break
            conn.send(msg.upper())
        except Exception:
            break
    conn.close()
s.close()

TCP客户端:

import socket

ip_port = ('127.0.0.1', 9000)
BUF_SIZE = 1024
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(ip_port)
while True:
    msg = input('>>:').strip()
    if len(msg) == 0: 
        continue
    s.send(msg.encode('utf-8'))
    feedbacks = s.recv(BUF_SIZE)
    print(feedbacks.decode('utf-8'))
s.close()

UDP服务端:

import socket
ip_port = ('127.0.0.1', 9000)
BUF_SIZE = 1024
u = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
u.bind(ip_port)
while True:
    msg, addr = u.recvfrom(BUF_SIZE)
    print(msg, addr)
    u.sendto(msg.upper(), addr)
u.close()

UDP客户端:

import socket
ip_port = ('127.0.0.1', 9000)
BUF_SIZE = 1024
u = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
while True:
    msg = input('>>:').strip()
    if not msg:
        continue
    u.sendto(msg.encode('utf-8'), ip_port)
    back_msg, addr = u.recvfrom(BUF_SIZE)
    print(back_msg.decode('utf-8'), addr)
u.close()